1.Heat the oil in a medium frying pan; add the capsicum and cook, stirring, until soft. Add garlic and spinach; cook, stirring, until spinach is wilted.
2.In a large bowl, combine rice, tuna, onion, dill, egg whites, capsicum mixture, rind and salt and pepper.
3.Spray the same heated non-stick frying pan with cooking oil spray. Return mixture to the pan, cook over medium heat, loosely covered with foil or a lid, for about 10 minutes or until the base is golden brown.
4.Wrap handle of frying pan with foil, place pan under a preheated grill for about 5 minutes or until set.
5.Invert rice cake onto a board; cut into wedges and serve with mixed salad leaves, if desired.
Not suitable to freeze. Not suitable to microwave. The spinach for the tuna rice cake may need to be cooked in batches if the frying pan is small.Note